Stop-valve



(No Model) 28heets-She'et,

P ..H.'HAMBLETON.

" STOP VALVE.

No. 290.044. Patented Dec. 11,1883.

J I l I H V H. .A. f e HHHI I IUUWI HHHI I I IM w. Z u, m 5 L Jim N.PETERS. MW Wm B. C.

7 I UNITED STATE-S "PATENT OFFICE.

sensors 1;. HAMB-LETON, or BALTIMORE, MARYLAND.

STOP-VALVE.

SPECIFICATION forming part ofiLetters Patent No. 290,044, dated December11, 1883.

" Application filed August 21, 1883. (No model.)

To all whom it may concern:

Be it known that I, FRANCIS H. HAMBLE- TON, of the city of Baltimore,and State of -Maryland, have invented certain Improvements inStop-Valves, of which the following is a specification.

This invention relates to certain improvements in a valve especiallydesigned for controlling-the passage of atmospheric air to a vesselcontaining an inflammable gas; but it may be used for various otherpurposes.

Inthe drawings forming a part hereoffFigures I and II are views, as seenfrom different points, of portions of a gas-making apparatus to which myimproved valve is applied. Figs. III and IV are enlarged views of thestopvalve.

form valves or gates. The face of the valves and the valveseats may beprovided with brass rings a and b, to admit of repairs, as shown in thedrawings; but these' rings are not'necessary to the operation of thevalve.

D is a cross-head, from which the disks 0 are suspended by means of rods0. These rods 0 pass through slots (1 in the cross-head D, which admitsof the disks being adjusted to the valve-seats, and the said rods arepro vided with collars and nuts, whereby, after the adjustment of thedisks, the said rods may be fastened. E is the valve-stem, which passesloosely through the upper end of the casing A, and it is threaded whereit is inclosed by I the cross-head D."

F is a wedge on the lower end of the valvestem E, which in the turningofthe valvestem is either forced between or drawn from contact with therounded projections G on the inner sides of the disks 0.

Fromthe foregoing: description it will be understood that the disks andcross-head and their attachments maybe elevated or depressed by means ofthe valve-stem without the same being turned, and that the disks can beslightly forced outward or distended, when in place, by turning the saidstem. In adj usting the disks it is designed to make them fit closelybetween the valve-seats, but without their exerting any great pressurethereon, and

I this pressure ofthe disks on the valve-seats is of a yieldingcharacter, in view of the clasticity of the rods 0. In forcing the wedgeF 'between the disks it is intended to only change this yielding, valvd;which consists of suspended disks, into a rigid device. To prevent thedistention of. the disks when the same are fully or partially elevated,{I provide the valvestem E with a grooved stop, H, having triangulardeflecting-pieces'e, and the shell A is fitted with ribs ffwith whichthe stop H engages as soon as the disks are slightly raised. It will beseen that the stop H has four slots, g,and the same number ofdeflecting-pieces e. v of the disks, theisteni E cannot be turned morethan a quarter fof a revolution, which is not sufficient,after the wedgeF has been withdrawn fromcontact with the curved surfaces G, to distendthe disks to such an extent as to cause distortion. I

I is a safety-valvelocated in the bottom of the casing A, andheldyieldingly to its seat by means of aspiral spring, h, and acrossbar, t. The lowerend of thevalve-stem is extended downward towardthe safety-valve, so that it willdepress and open the said valvetherefor to its full extent when the disks are I is closed by itsspring; Consequently air or gas can pass through the valve withoutescape. When the disks are closed and the safety-valve I open, anyleakage of air or gas has free access to the outer air.

To fully understand the principal use to which I design 'to apply thisvalve, reference should be had to Figs. I and II, in which K and L arerespectively the generator and the In this apparatus the air-blast isintermit- -tingly forced to the generator K through the pipes M and N,in the latter one of which the improved valve is located. ,Now, when theair-blast is stopped, the gas-pressure in the generator K exceeds that-of the air in the 'blast-pipeL It follows, therefore, that if the thedisks 0 "and, if there is .no means of escape, mixes with the air in theblast-pipe and forms an explosive mixture. With my valve this mixing ofgases cannot occur, as the gas,

Consequently, in the elevation valve is not absolutely tight gas escapespastclosed, and when the disks are raised the valve main air-blast pipeof a water-gas apparatus.

in seeking the means of escape offering the least resistance, passes thesafety-valve I to l the outer air. The moving parts of the valve arecounterbalanced by a weight, which is attached to a swivel, 0, (shown inFig. I,) on the end of the valve-stem, by means of a cord passing over asheave. lhe turning of the valve-stem is accomplished by hand throughthe medium of a wheel on lever I.

I claim as myinvention 1. In a stop-valve, the combination of anon-rotative cross-head adapted to have a vertical sliding movement inthe valve-shell, a pair of disks or gates suspended from the saidcross-head by means of rods, a sliding valve-stem threaded where itpasses through the said cross-head, and a wedge attached to the lowerend of the valve-stem, which in the turning of the said stem is eitherforced between or removed from contact with the said disks,substantially as and for the purpose specified.

2. In a stop-valve, the disks thereof, suspended from a cross-head bymeans of rods which pass through slots in the said crosshead, wherebythe said disks may be adjusted to their seats, substantially asspecified.

3. In a stop-valve, the shell thereof, provided with aninwardly-projecting rib, and

the stem with a slot-ted stop, which in the opening of the valve engageswith the said rib and prevents the turning of the stem, substantially asand for the purpose specified.

FRANCIS H. IIAMBLETOX. Witnesses:

Wit. '1. HOWARD, REXOUX

